FTP folder

Hello everyone.I installed an ubuntu super server. I want to upload some local files to the ftp server for some devices of my system (cisco ip phones)to go and grab them. Where should I place the files on the FTP server to be found.? . I supposed to place the files on the TFTP root, but I dont know where it is. How do i know that the FTP server is running and listening for requests? I already opened up ports 21 and 22 and I was able to telnet the tftp server.